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Learn a Fact: 1 x 4

1
4
x  1
2
0
x  2
3
9
x  1
4
4
x  0
5
0
x  9
6
6
x  1
7
1
x  8
8
5
x  0
9
0
x  8
10
1
x  1
11
1
x  0
12
1
x  7
13
0
x  7
14
6
x  0
15
3
x  0
16
1
x  3
17
1
x  2
18
1
x  5

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x4


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4

x1


4

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